scripts: perftune.py: change the network module mode auto selection heuristic
scripts: perftune.py: change the network module mode auto selection heuristic

Change it to be just like to one we use for the disk module except for using the MQ when
number of NIC Rx queues is equal to the number of CPUs (hyper threads):

 * Use MQ only when number HTs is less or equal than 4 or when number of Rx queues equals to the number of HTs.
 * Use SQ when number of physical cores is less or equal to 4.
 * Use SQ-split in all other cases.

Signed-off-by: Vlad Zolotarov <976c0f8d0852ed6439ad273880b400a75a7c41d0@scylladb.com>
Message-Id: <1502378098-31538-1-git-send-email-976c0f8d0852ed6439ad273880b400a75a7c41d0@scylladb.com>

scylladb/seastar,cloudius-systems/seastar,dreamsxin/seastar,scylladb/seastar,avikivity/seastar,cloudius-systems/seastar,cloudius-systems/seastar,avikivity/seastar,dreamsxin/seastar,syuu1228/seastar,scylladb/seastar,avikivity/seastar,dreamsxin/seastar,syuu1228/seastar,syuu1228/seastar